In Spanish, adjectives can follow or come before the noun they serve.
After: the noun is used to distinguish between two objects.
¿Qué jersey prefieres, el (jersey) verde o el (jersey) azul? (Which sweater do you prefer: the green one or the blue one?)
Ella vive en un edificio pequeño. (She lives in a small building).
Before: the noun is used to specify a quality.
La vieja televisión ya no funciona. (The old television doesn’t work anymore).
Mi hermano es un buen escritor. (My brother is a good writer).

But some adjectives can only follow the noun:
Color: El coche es rojo. (The car is red).
Shape: La mesa es cuadrada. (The table is a square).
State: El vaso está vacío. (The glass is empty).